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供电3.3V,重新上电能复位，死机后外部32.768K停震。下面是时钟部分配置， */
// Configure one FRAM waitstate as required by the device datasheet for MCLK
// operation beyond 8MHz _before_ configuring the clock system.
FRCTL0 = FRCTLPW | NWAITS_1;
// Clock System Setup
CSCTL0_H = CSKEY >> 8; // Unlock CS registers
CSCTL1 = DCOFSEL_4 | DCORSEL; // Set DCO to 16MHz
CSCTL2 = SELA__LFXTCLK | SELS__DCOCLK | SELM__DCOCLK; // Set SMCLK = MCLK = DCO,
// ACLK = 32768
CSCTL3 = DIVA__1 | DIVS__2 | DIVM__1; // Set all dividers SMCLK=8Mhz
do
{
CSCTL5 &= ~LFXTOFFG; // Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
CSCTL0_H = 0;
用IO输出内部DCO的时钟，在死机后，内部时钟没有输出
外部有复位芯片，示波器看了有外部复位信号过来的
